Abstract
We investigate the use of single carrier frequency domain equalization (SCFDE) over a diffuse optical wireless (DOW) communications. Recently orthogonal frequency division multiplexing (OFDM) has been applied to DOW communications. However, due to high peak-to-average power ratio (PAPR), the performance of OFDM can severely be affected by the nonlinear characteristics of light emitting diodes (LED). To avoid a PAPR problem, we present in this paper a modified form of SCFDE for DOW communications. We propose three different ways of using SCFDE with DOW communications and show that they exhibit lower PAPR and provide better bit-error rate (BER) performance in the presence of the LED nonlinearity.
Highlights
Due the increase in the number of portable information terminals in work and at home, the demand for highspeed indoor wireless communication has been growing
We propose in this paper two other schemes for generating real, positive signals with low peak-to-average power ratio (PAPR) for intensity modulation and direct detection (IM/DD) optical Diffuse optical wireless (DOW) communications using single carrier frequency domain equalization (SCFDE)
asymmetrically clipped optical (ACO) and DC-biased are two ways to obtain real positive signals from complex constellation symbols such as QPSK and M-QAM considered in this paper. As it was shown in [7] that ACO-orthogonal frequency division multiplexing (OFDM) is more power efficient than DCbiased OFDM, in this paper, we focus on ACO which we applied to SCFDE and compare it with ACOOFDM
Summary
Due the increase in the number of portable information terminals in work and at home, the demand for highspeed indoor wireless communication has been growing. The additional complexity of the extra FFT at the transmitter, which is needed to obtain the Hermitian constraint on the frequency domain symbols, is offset by the fact that in SCFDE, the PAPR is reduced and better BER performance can be achieved when the signal is sent through a nonlinear LED. (iii) the size of the IFFT at the transmitter is 2N + 2 while it is 4N for ACO-SCFDE and ACO-OFDM With this scheme, a different technique than the Hermitian symmetry constraint is used to generate the real positive symbols needed for intensity modulated direct detection (IM/DD) optical communication. A CP is added to each subblock to yield the (N + L) × 1 vectors sI,i and sQ,i, and the following 4(N + L) real and positive symbol block x is transmitted x = sI+ , sI− , sQ+ , sQ− T.
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